28010531 has 2 divisors, whose sum is σ = 28010532. Its totient is φ = 28010530.

The previous prime is 28010497. The next prime is 28010533. The reversal of 28010531 is 13501082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28010531 - 2¹⁸ = 27748387 is a prime.

It is a super-2 number, since 2×28010531² = 1569179693803922, which contains 22 as substring.

Together with 28010533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28010533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005265 + 14005266.

It is an arithmetic number, because the mean of its divisors is an integer number (14005266).

Almost surely, 2^28010531 is an apocalyptic number.

28010531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28010531 is an equidigital number, since it uses as much as digits as its factorization.

28010531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 28010531 is about 5292.4976145484. The cubic root of 28010531 is about 303.6969618426.

The spelling of 28010531 in words is "twenty-eight million, ten thousand, five hundred thirty-one".